Drinking mug



FIG. 1 is a front perspective view of a drinking mug showing my new design;

FIG. 2 is a top plan view of the drinking mug;

FIG. 3 is a side elevation of the drinking mug;

FIG. 4 is a front elevation of the drinking mug;

FIG. 5 is a bottom plan view ofthe drinking mug; and

FIG. 6 is a back elevation of the drinking mug. 

The ornamental design for a drinking mug, substantially as shown. 